Brt-577. Wt = 13.46g. Diam = 17.3-22.6mm

Photo from Bob Johnston

 

Wt = 13.33g. Diam = 17.3-20.5mm. RY not very clear. Ken thought RY 26 but RY 24 seems more likely.

Stevens Collection

 

Wt = 13.34g

Photo from Jay Raiveeson